Phonograph-record composition.



J. W. AYLSWORTH.

PHONOGRAPH RECORD COMPOSITION.

APPLICATION TILED NOV. 7, 1906. RENEWED 001.212, 1908.

920,245, Patented May 4, 1909.

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JONAS W. AYLSWOR'IH,OF EAST ORANGE, NEW JERSEY, ASSIGNOR TO NEW JERSEY PATENT COMPANY, OF WEST ORANGE, NEW JERSEY, A CORPORATION OF NEW JERSEY.

IPHOi lOGRAPH-RIMJORD COMPOSITION.

. I v e No. 920,245. Specification oiLe'tters Patent. Patented May 4, 1909.

Application filed November '7, 1906, Serial No. 342,317. Renewed October 12, 1908. $eria1 N0. 4573M.

' To all whom it may concern: composition in which asphalt is mixed with Be. it known that I, JONAS W. AYLsstearate of soda, which latter is a very coniwon'rrr, a citizen of the United States, residnion ingredient in the art, a homogeneous 7 ing at 2-23 Midland avenue, East Orange, compound can not be produced, but a mix- -5 county ofEsseX, and. State of New Jersey, ture of asphalt and stearate of lead is entirely have invented certain new and useful Imhomogeneous and possesses the desirable 'provements in Phono raph-Itecord Co'mpoqualities indicated. sition,o.f which the fol owing is a description. i My improved composition is designed My invention relates to an improved comespecially for use in the manufacture of dulO position for duplicate phonograph records, plicate sound records by a process in which and my object is to rovide a composition the material is distributed over the bore of a j for the purpose, whic is cheap, extremely rapidly rotating mold by centrifugal force, durable, smooth, tough, and of very superior as I disclose in application for Letters Patent wearing qualitiesof the United States, filed May 11, 1906, Se-

15 Although myimproved composition 'is rial No. 316,250. .much cheaper than compositions now used As an example of a convenient process for inlthe art,.it-is equally as smooth, so that manufacturing my improved composition, the reproduction is as free from scratching the following operations may be performed: 3 and foreign noises, while at the same time the 400 lbs. of commercial stearic acid, prefer- 2 0 materialis so very hard and tough that the i ably having no more than 5% oleic acid, vreproducers may be provided with heavier and free from uncombined fats and glycerin,

Weightastiffer iaphragms, and with reater is added to 200 lbs. of resin gum (suchas 7 5 leverage between the Styluses an diacopal, kauri or colophony) and melted at hragrns than is now possible, so as to secure a temperature from 250 to 400 degreesF. 25 ouder and better reproduction; or, onthe When the stearic acid and the gum are other hand,the records may be formed with 1 thoro'ughly melted I then add 100 lbs. of

grooves of finer pitch,-necessitating' a smaller litharge or mid of lead, which results in the 8 -reproducingstylus,so as to increasethelength formation of stearate of lead with ossible of the reproduction. My composition,infact, i traces of free stearic acid, and possib y some 30. is .so hard and; durable that a .recordmade rosin acid salts of lead. The reaction results therefrom having a pitch of- 200 threads or in the generation of water, which is driven inch, and engaged by a reproducing sty us oil as steam. After the formation of the of about one-fourth the diameternow used, stearate of lead, I now add a suitable proporwill be substantially as durable as composition of a hard asphalt, such as ,gi sonite, 1' g 35 .tions at present in use with phonographs Egy tian or Syrian asphalt, the amount dehavin 100 threads per inch. In my dinpen ing on the ualities desired in the ulti- 'prove' composition, I make use ofa 'relamate product, ith the amount of stearic tively large percentage of asphalt, which is acid indicated, from 100 to 400 lbs. of asa very cheap and hard material. I am aware phalt may be introdueed. I do not consider .40 that asphalt has been previously suggested it desirable to add more than 400 lbs. of asasan'ingredient in thesecompositions, but phalt, because in that case, the material is owing to its very slight 'coefficient of expanikely to become'too v1sc1d,and can be mold 'sion-and its sticky nature while hot, it has ed only with great difficulty unless very high jneverbeen satisfactorily used. I find that temperatures are used, and which are apt to 4.5 averjsuperiorcomposition can be made by injure the molds. After the introduction of combining asphalt with stearate of lead, and the as halt, a temperature of about 400 ded -preferably. a resin gum, such as copal, grees is mamtamed'until allproducts of auri,)or colophony. A resin gum is. dQSlI decomposition have been driven off, and the able in the 'comositi'omlas it tends tocormaterial has become entirely limpid and met any cryst'a 'zation which might exist 'uiescent. The compositionis nowcarefully i'ntho stearate of lead, and also adds .to the "filtered, preferably through several layers tough and durable qualities of the composiof muslin and is hen ready-for use, or if ts:

tion. ,Ifthe attempt is made 'toproduce a desired, the steam: "acid and asphalt may be purity for my purpose, contains Havmg now describe 20 Y mixed and filtered before the litharge is addimproved composition for sound ed, practically all the impurities being in the records, comprising a mixture of asphalt and two first mentioned ingredients. stearate of lead, substantially as set forth.

In order that the invention may be better understood,.attention is directed to the accom anyingdrawing, in which I illustrate a dup cate phonograph record, composed of my referred com o'sition. k I 4 ile I have-referred to the use of stearic acid throu bout the above description, it will of course e evident that its common and well known equivalent, palmitic acid, may be substituted therefor Without changing the characteristics of the composition, or its mode of manufacture. As a matter of fact, ordinary commercial stearic acid, of sufficient generally almitic acid. I my invention,what I claim as' new and desire to secure by Letters Patent, is as follows:

1. An improved composition for sound JONAS W. AYLSWORTH. records, comprising a mixture of asphalt, and Witnesses:

a metallic stearate, substantially as and for FRANK L. DYER, the purposes set forth. ANNA R. KLEHM;

lmprov'ed composition for sound records, comprising a mlxture of asphalt, a metallic stearate and a resin gum, substantially as set forth.

4. An improved composition for sound records, comprisinga mixture of as halt, stearate of, lead, and a tially as set forth.

improved comp resin gum, su

osition for sound metallic stearate tially as set forth.

improved composition for sound records, comprising a' mixture of asphalt, stearate of lead, and copal gum, substantially as set forth.

This s ecification signed and witnessed this 3rd (lay of November 1906.

and copal gum, substanabout fifty per cent. of

records, comprising a mixture of asphalt, av 

